System of power supply



Sept. .28 1926.

o. s. FIELD SYSTEM OF POWER SUPPLY Filed March 19, 1925 INVENTOR BY QSXM ATTORNEY Patented Sept. 28, 1926. l i

UNITED STATES PATENT OFFICE.

OSCAR S. FIELD, OF ROSELLE, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS,TO

THE UNION SWITCH dc SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANA, A GOR-POBATION OF PENNSYLVANIA.

SYSTEM OF POWER SUPPLY.

Application filed March 19, 1925. Serial No. 16,868.

My invention relates in general to systems of power supply and moreparticularly to a system where energy applied to the primary winding ofan electro-magnetic device supplies power from a secondary winding onsaid device through a contact controlled by the primary winding.

One object of my invention is to provide an improved, simple andautomatic method or means for closing a secondary load circuit byenergizing a primary supply circuit. A further object is to provide anautomatic means for transferring the load from the said secondarywinding to an auxiliary source of supply upon the de-energizat-ion ofthe primary winding. Other objects and advantages will appear. from thedescription which follows.

In various electrical systems it is neces sary to maintain a loadcircuit closed in practical continuity, regardless of the condi tion ofthe normal or primary energy supply. Heretofore, manual means have beenemployed to make available the primary energy supply, or the auxiliarysupply when the primary supply failed. Where automatic action wasdesired, recourse was had to auxiliary appartus such as relays etc. toaccomplish this object. In the present invention an eificienttransformer and an automatic and effective circuit closing device iscombined in one piece of apparatus making for economy and for efliciencyof service.

One type of apparatus embodying my invention is shown in theaccompanying drawing in which Fig. 1 is an elevation of the device with.cover removed to show the operating elements.

Fig. 2 is a side view, partly in section, of Fig. 1, and

Fig. 3 is a circuit diagram showing the electrical connections.

Referring now to the drawing, there is disclosed a transformer relaystructure having a laminated magnetic core portion 2 fastened firmly tothe supporting case 1 and a movable yoke or armature portion 3 flexiblysupported by the strap 4 which is made fast to case 1. On the core 2 aresupported in any suitable manner the primary winding 5 and the secondaryWinding 6.

The yoke 3 has grooves-7 and 8 into which are fastened short-circuitedrings or shading bands 9 and 10 of any suitable non-magnetic materialhaving relatively high conductivity. The shading bands 9 and 10 arepurposely made to extend above the face of the yoke maintaining anairgap when the structure is energized and insuring desirable releasingaction. The bands 9 and 10 are spaced on the yoke in such a way thatthey rest on about the middle of the outer pole faces of core 2 withyoke picked up, thus causing a portion of the pole flux to include theband associated therewith and eliminating undesirable chatter andvibration in a way which is well known to those versed in alternatingcurrent phenomena.

Supported in any suitable way to the case 1 is a terminal block 11 ofinsulating material to which are connected the taps of the secondarywinding 6. Fixed to the yoke 3 and insulated therefrom are contactfingers 12 and '13 which make contact with the left hand pair of contactposts, one of which is shown at 14, when the structure is energized, andwith the right hand pair of contact posts, one of which can be seen at15, when the structure is de-energized. The fingers 12 and 13,cooperating with posts 15 serve as a stop for the armature or yoke inthe de-energized position.

F astened to the case 1 is a terminal panel 16 of insulating material inwhich are located the following terminal posts: 17 to which'is connectedthe primary winding 5 and to which is applied the alternating currentsupply; posts 18 to which are fixed the contact blocks 14; posts 19 towhich are fastened the contact blocks 15 and to which is connected theauxiliary energy supply when used; and posts 20 to which the load isapplied and which are connected to the fingers 12 and 13 by means ofconnectors 21.

The operation of the device is as follows:

With alternating current energy applied to winding 5 there is set up aflux in the core 2 which causes the yolie 3 to be attracted and held inintii'nate contact with the core 2. This upward movement of the yokebrings the lingers 12 and 13 in contact with posts ll thus applying thesecondarv voltage induced in winding 6 to the load circuit connected at20. By means of the connectors 22 and LS any desired secondary voltagewithin the range of the instrument can be applied to the load circuit.

.Yhcn winding is de-energized, the yoke 3 drops and the fingers l2 and13 break away from posts ll and make contact with posts 15, causing theauxiliary or emergency source of energy to be applied to the loadcircuit.

Referring to the circuit diagram shown in i 3, ith alternating currentenergy ay- (T )lied to posts 17 and 17 the operating cir- 1 our; for thedevice may be traced as follows: Starting at terminal 2-l of thesecondary connector 22, linger l2, connector 2t), load circuit, post 20,connector iii l connector 22: and to post 25 of the secondary winning.

Vfith energy removed. from the primary winding, the auxiliary energysupply is made mrailable as follows: from the positiv terminal at post19, contact block 15, linger 12, connector 21, post 20, load circuit,post 20, connector2l, linger 13, contact post 15 to negative terminal atpost 19'.

Although I have chosen the particular structure herein described as theone most clearly illustrating the novel features of my invention, I wishit to be understood that many modifications can be made therein withoutdeparting from the spirit and scope of the invention.

lihat is claimed is:

1. In a system of power supply, an electromagnetic structure having aprimary winding adapted to be energized from an alternating currentsource of supply, a sec ondary winding, a circuit including saidsecondary "inding and a normally open contact, and means for closingsaid contact when said electromagnetic structure is energized.

2. In a system of power supply, a divided laminated structure, primaryand secondary windings on said structure in inductive relation to eachother, and means operated by a portion of i 'l structure for connectingsaid secondary winding to a secondary circuit when the primary windingis energized.

In a system of power supply, a divided laminated structure, having astationary portion and a movable portion, primary and secondary windingson the stationary portion of said structure, a normally open contactcarried by the movable portion of said structure and closed when thestationary portion attracts the movable portion due to said primarybeing energized, and a circuit for said secondary winding controlled bysaid contact.

In a system of power supply, a divided laminated structure, having astationary portion and a movable portion, primary and secondary windingson said structure, a normally open contact carried by the movableportion of said structure and closed when the movable portion isattracted to the'stationary portion due to the primary winding beingenergized, a circuit for said secondarylwinding controlled by saidcontact, and a band on said structure to prevent chattering of saidmovable portion when the structure is energized.

In a system of power supply, atransformer having a relatively largeair-gap in its magnetic structure when the primary winding isde-energized and a relatively small air gap when the primary winding isenergized and means whereby upon reduction of said air-gap due toenergization of the primary winding of said transformer the circuit ofthe secondary winding is closed.

6. A transformer provided with primary and secondary windings, themagnetic structure of which is in a plurality of parts and a thirdwinding on said transformer where by upon encrgization of the primarysaid parts are continuously held in intimate contact.

i". In combination in a transformer, a divided laminated magneticstructure, means for flexibly holding the parts in operative relation,an output winding on the same, and means controlled by theenergizationof the transformer for closing the circuit-of the outputwinding.

8. A transformer provided with primary and secondary windings themagnetic structure of which is in a plurality of relatively movableparts, and means associated with said structure whereby uponenergization of the primary said parts are continuously held in intimatecontact.

l). A system of power supply comprising a transformer, an alternatingcurrent source of supply therefor, a secondary load for saidtransformer, 21 secondary source of power upply, and means controlled bysaid transformer for automatically connecting said secondary load tosaidsecondary source of power supply in response to (lo-energizetion ofthe transformer. 1

10. A system of power supply compris ing a transformer, an alternatingcurrent source of supply therefor,la secondary load for saidtransformer, a secondary source of power supply, and means controlled bysaid transformer for automatically disconnecting said secondary loadfrom the output winding and connecting the load with said sec ondarysource of power supply in response to de-energization of thetransformer."

11. In an electromagnetic device, a lamisaid emergency source or withthe secondnated core structure, primary and secondary winding accordingas the primary windary windings on said structure, a yoke strucing isdie-energized or energized. ture flexibly held in operative relation toIn testimony whereof, I have signed my 5 said core structure, anemergency source of name to this specification.

energy supply, a load, and contacts on said yoke structure forconnecting said load with OSCAR S. FIELD.

